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Real Estate and Intangible Assets - Summary of Lease Expirations by Year for Properties with Leases (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 Lease acre | Mar. 31, 2014 acre
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 30 land_NumberOfExpiringLeases |
Expiring Leased Acreage | 8,789 us-gaap_AreaOfRealEstateProperty | 6,000 us-gaap_AreaOfRealEstateProperty
% of Total Acreage | 100.00%land_PercentageOfAggregateAcreage |
Rental Revenue for the Three Ended March 31, 2015 | $ 2,622,327 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | $ 1,495,636 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
% of Total Rental Revenue | 100.00%land_PercentageOfAggregateRentalRevenue |
2015 [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 4 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueRemainderOfFiscalYearMember |
Expiring Leased Acreage | 405 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueRemainderOfFiscalYearMember |
% of Total Acreage | 4.60%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueRemainderOfFiscalYearMember |
Rental Revenue for the Three Ended March 31, 2015 | 351,496 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueRemainderOfFiscalYearMember |
% of Total Rental Revenue | 13.40%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueRemainderOfFiscalYearMember |
2016 [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 1 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueCurrentMember |
Expiring Leased Acreage | 331 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueCurrentMember |
% of Total Acreage | 3.80%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueCurrentMember |
Rental Revenue for the Three Ended March 31, 2015 | 186,216 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueCurrentMember |
% of Total Rental Revenue | 7.10%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueCurrentMember |
2017 [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 7 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearTwoMember |
Expiring Leased Acreage | 351 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearTwoMember |
% of Total Acreage | 4.00%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearTwoMember |
Rental Revenue for the Three Ended March 31, 2015 | 235,144 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearTwoMember |
% of Total Rental Revenue | 9.00%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearTwoMember |
2018 [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 3 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearThreeMember |
Expiring Leased Acreage | 370 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearThreeMember |
% of Total Acreage | 4.20%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearThreeMember |
Rental Revenue for the Three Ended March 31, 2015 | 92,121 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearThreeMember |
% of Total Rental Revenue | 3.50%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearThreeMember |
2019 [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 0 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFourMember |
Expiring Leased Acreage | 0 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFourMember |
% of Total Acreage | 0.00%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFourMember |
% of Total Rental Revenue | 0.00%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFourMember |
2020 [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 4 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFiveMember |
Expiring Leased Acreage | 1,138 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFiveMember |
% of Total Acreage | 12.90%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFiveMember |
Rental Revenue for the Three Ended March 31, 2015 | 743,216 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFiveMember |
% of Total Rental Revenue | 28.30%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueInYearFiveMember |
Thereafter [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Number of Expiring Leases | 11 land_NumberOfExpiringLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueThereafterMember |
Expiring Leased Acreage | 6,194 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueThereafterMember |
% of Total Acreage | 70.50%land_PercentageOfAggregateAcreage / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueThereafterMember |
Rental Revenue for the Three Ended March 31, 2015 | $ 1,014,134 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueThereafterMember |
% of Total Rental Revenue | 38.70%land_PercentageOfAggregateRentalRevenue / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = land_LeaseExpirationsDueThereafterMember |

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- Definition Percentage of aggregate acreage. + References No definition available. + Details
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- Definition Percentage of aggregate rental revenue. + References No definition available. + Details
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X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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